bduerringer
Member
I am an OEM and have just come across article 409.110 - panel marking, from a customer who is asking for this. While most of the requirements seem straight forward enough, there are a couple of questions/issues I have. I admit I am behind in what has been going on with the code for at least the last two editions.
So far I have been ignored by my panel builder and my other component suppliers as how this applies to my panels. Square D is the only place where I can get an explanation of the panel marking requirement, but they leave off the critical UL stuff, which just happens to be quite prominent in their explanations. I did find the UL table SB4.1 that figures into their info and how it will apply to some of my equipment.
1. SCCR data only applies to 200V (and above) type of control panels. 120V or transformer secondary voltages is not applicable. My panels are primarily 400V primary with either 230V or 120V secondaries. I have 120V only control panels around my machine and I am going forward that no labeling is required for these.
2. What is the purpose of the SCCR on the marking? I get the fire hazard idea but cannot find much explanation to put my hands on when it comes to the SCCR. I just haven't come across this type of application requirement.
3. Does the marking have to be outside the panel or can it be inside? My guess is that it does not matter.
So far I have been ignored by my panel builder and my other component suppliers as how this applies to my panels. Square D is the only place where I can get an explanation of the panel marking requirement, but they leave off the critical UL stuff, which just happens to be quite prominent in their explanations. I did find the UL table SB4.1 that figures into their info and how it will apply to some of my equipment.
1. SCCR data only applies to 200V (and above) type of control panels. 120V or transformer secondary voltages is not applicable. My panels are primarily 400V primary with either 230V or 120V secondaries. I have 120V only control panels around my machine and I am going forward that no labeling is required for these.
2. What is the purpose of the SCCR on the marking? I get the fire hazard idea but cannot find much explanation to put my hands on when it comes to the SCCR. I just haven't come across this type of application requirement.
3. Does the marking have to be outside the panel or can it be inside? My guess is that it does not matter.
